The true statement regarding the basic solution is that the molarity of hydronium ion is lower than the molarity of hydroxide ion.
pH scale is used to measure the nature of any solution and it will be calculated as:
pH = -log[H⁺]
The solution which is basic in nature means will have higher concentration of hydroxide ion and lower concentration of hydronium ion.
Hence, the molarity of hydronium ion is lower than the molarity of hydroxide ion.
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